Joseph Sjouwerman and Esther Vega married in 1904 in Amsterdam. They had four children, among whom Betsie.
Stadsarchief Amsterdam, archiefkaart Joseph Sjouwerman
In addition, a Jokos file (number 20363) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Person is in the National Database of Victims of Persecution